The Scion Oxygen Sensor monitors the ratio of air and fuel in the exhaust and reports it to the engine control unit (ECU). The ratio of air and fuel that gives maximum efficiency is called a “perfect ratio”. There are two possible mixtures of air and fuel in the combustion chamber: rich and lean. The mixture is rich when the amount of air is less than that of the perfect ratio and is lean when there is excess air than that of the perfect ratio. If these mixtures are detected, the fuel injection is regulated to maintain a perfect air-fuel ratio.

If you have issues with your Scion Oxygen Sensor, you must replace it as soon as possible. Buy Auto Parts sells a wide range of parts for every car make and model at unbeatable prices. We have genuine OEM replacements and premium aftermarket parts. All our car parts are tested thoroughly and come with a warranty. We provide free shipping on all orders above US $99.

Ordering car parts online has never been easier. To place an order for your Oxygen Sensor, you just need to select the right year, make and model of your car on our online catalog. If you have difficulties in finding a Oxygen Sensor for your Scion, call us and we will find it for you. As we have warehouses all across the country, Buy Auto Parts will make sure your orders are delivered on time.

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